/* * settings version 1.0.0 * * ANSI C implementation for managing application settings. * * settings.h * * Copyright (c) 2009 Per Ola Kristensson. * * Per Ola Kristensson * Inference Group, Department of Physics * University of Cambridge * Cavendish Laboratory * JJ Thomson Avenue * CB3 0HE Cambridge * United Kingdom * * settings is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * settings is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with settings. If not, see . */ #ifndef _SETTINGS_H_ #define _SETTINGS_H_ #include #include #include #include #include "strmap.h" #ifdef __cplusplus extern "C" { #endif typedef struct Settings Settings; /* * This callback function is called once per key-value when enumerating * all keys inside a section. * * Parameters: * * key: A pointer to a null-terminated C string. The string must not * be modified by the client. * * value: A pointer to a null-terminated C string. The string must * not be modified by the client. * * obj: A pointer to a client-specific object. This parameter may be * null. * * Return value: None. */ typedef void(*settings_section_enum_func)(const char *key, const char *value, const void *obj); /* * Creates a settings object. * * Return value: A pointer to a settings object, * or null if a new settings object could not be allocated. */ Settings * settings_new(); /* * Releases all memory held by a settings object. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * If the supplied settings object has been previously released, the * behaviour of this function is undefined. * * Return value: None. */ void settings_delete(Settings *settings); /* * Constructs a settings object by loading settings in textual form * from the given stream. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * stream: A pointer to a stream. This parameter cannot be null. * * Return value: A pointer to a settings object, * or null if an error occurred. */ Settings * settings_open(FILE *stream); /* * Saves the current settings object in textual form to the given stream. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * stream: A pointer to a stream. This parameter cannot be null. * * Return value: 1 if the operation succeeded, 0 otherwise. */ int settings_save(const Settings *settings, FILE *stream); /* * Returns the value associated with the supplied key in the * provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * key: A pointer to a null-terminated C string. This parameter cannot * be null. * * out_buf: A pointer to an output buffer which will contain the value, * if it exists and fits into the buffer. * * n_out_buf: The size of the output buffer in bytes. * * Return value: If out_buf is set to null and n_out_buf is set to 0 the return * value will be the number of bytes required to store the value (if it exists) * and its null-terminator. For all other parameter configurations the return value * is 1 if an associated value was found and completely copied into the output buffer, * 0 otherwise. */ int settings_get(const Settings *settings, const char *section, const char *key, char *out_buf, unsigned int n_out_buf); /* * Returns the integer value associated with the supplied key in the * provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * key: A pointer to a null-terminated C string. This parameter cannot * be null. * * Return value: The integer value associated to the provided section and * key, or 0 if no such value exists. */ int settings_get_int(const Settings *settings, const char *section, const char *key); /* * Returns the long integer value associated with the supplied key in the * provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * key: A pointer to a null-terminated C string. This parameter cannot * be null. * * Return value: The long integer value associated to the provided section and * key, or 0 if no such value exists. */ long settings_get_long(const Settings *settings, const char *section, const char *key); /* * Returns the double value associated with the supplied key in the * provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * key: A pointer to a null-terminated C string. This parameter cannot * be null. * * Return value: The double value associated to the provided section and * key, or 0 if no such value exists. */ double settings_get_double(const Settings *settings, const char *section, const char *key); /* * Returns the integer tuple associated with the supplied key in the * provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * key: A pointer to a null-terminated C string. This parameter cannot * be null. * * out: A pointer to an output buffer. * * n_out: The maximum number of elements the output buffer can hold. * * Return value: 1 if the entire tuple was copied into the output buffer, * 0 otherwise. */ int settings_get_int_tuple(const Settings *settings, const char *section, const char *key, int *out, unsigned int n_out); /* * Returns the long tuple associated with the supplied key in the * provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * key: A pointer to a null-terminated C string. This parameter cannot * be null. * * out: A pointer to an output buffer. * * n_out: The maximum number of elements the output buffer can hold. * * Return value: 1 if the entire tuple was copied into the output buffer, * 0 otherwise. */ long settings_get_long_tuple(const Settings *settings, const char *section, const char *key, long *out, unsigned int n_out); /* * Returns the double tuple associated with the supplied key in the * provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * key: A pointer to a null-terminated C string. This parameter cannot * be null. * * out: A pointer to an output buffer. * * n_out: The maximum number of elements the output buffer can hold. * * Return value: 1 if the entire tuple was copied into the output buffer, * 0 otherwise. */ double settings_get_double_tuple(const Settings *settings, const char *section, const char *key, double *out, unsigned int n_out); /* * Associates a value with the supplied key in the provided section. * If the key is already associated with a value, the previous value * is replaced. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. The string must have a string length > 0. The string will * be copied. * * key: A pointer to a null-terminated C string. This parameter * cannot be null. The string must have a string length > 0. The * string will be copied. * * value: A pointer to a null-terminated C string. This parameter * cannot be null. The string must have a string length > 0. The * string will be copied. * * Return value: 1 if the association succeeded, 0 otherwise. */ int settings_set(Settings *setting, const char *section, const char *key, const char *value); /* * Returns the number of associations between keys and values that exist * in the provided section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * Return value: The number of associations between keys and values in * the provided section. */ int settings_section_get_count(const Settings *settings, const char *section); /* * Enumerates all associations between keys and values in the provided * section. * * Parameters: * * settings: A pointer to a settings object. This parameter cannot be null. * * section: A pointer to a null-terminated C string. This parameter cannot * be null. * * enum_func: A pointer to a callback function that will be * called by this procedure once for every key associated * with a value. This parameter cannot be null. * * obj: A pointer to a client-specific object. This parameter will be * passed back to the client's callback function. This parameter can * be null. * * Return value: 1 if enumeration completed, 0 otherwise. */ int settings_section_enum(const Settings *settings, const char *section, settings_section_enum_func enum_func, const void *obj); #ifdef __cplusplus } #endif #endif /* GNU LESSER GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 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